I²C
With CSB tied to VID, CAD1:CAD0 select 0x0C–0x0F. The measurement data includes little-endian signed axis values.
AK8963 three-axis magnetometer pinout
The AK8963 measures magnetic field on three axes with I²C or 4-wire SPI and stores factory sensitivity coefficients in fuse ROM.
QFN-16 · 3 × 3 mm 16 contacts
WLCSP-14 · 1.59 × 1.59 mm
14 contacts Current packageWLCSP-14 · 1.59 × 1.59 mm pinout
4321 D C B A
C2 · TST1
Test input with internal pull-down. Leave open or connect to VSS.
All 14 pins
| Pin | Signal | Direction | Function |
|---|---|---|---|
| A1 | DRDY Output | Output | Active-high data-ready signal. The host can also read the data-ready status bit. |
| A2 | CSB Input | Input | Active-low SPI chip select. Tie to VID for I²C. |
| A3 | SCL/SK Input | Input | Clock input in either I²C or SPI mode. |
| A4 | SDA/SI Bidirectional | Bidirectional | Open-drain data in I²C mode or host-to-sensor data input in SPI mode. |
| B1 | VDD Supply input | Supply input | Device supply. Place the bypass capacitor close to this pin. |
| B3 | RSV Leave open | Leave open | Reserved output. Keep electrically disconnected. |
| B4 | SO Output | Output | Sensor-to-host data output in SPI mode. Leave open in I²C mode. |
| C1 | VSS Supply return | Supply return | Common analog and digital return. |
| C2 | TST1 Input | Input | Test input with internal pull-down. Leave open or connect to VSS. |
| C3 | TRG Input | Input | External measurement trigger. Internally pulled down. Ground or leave open when unused. |
| C4 | VID Supply input | Supply input | Digital interface rail. Use this rail for I²C pull-ups and inactive CSB/RSTN. |
| D1 | CAD0 Input | Input | I²C address bit 0. Strap to VDD or VSS. Tie to VSS for SPI. |
| D2 | CAD1 Input | Input | I²C address bit 1. Strap to VDD or VSS. Tie to VSS for SPI. |
| D4 | RSTN Input | Input | Active-low hardware reset. Tie to VID if unused. |
Signal assignments
4-wire SPI
Use separate host-to-sensor and sensor-to-host data paths with both address straps grounded.
Electrical limits
| Parameter | Limit | Conditions and source |
|---|---|---|
| Analog supply VDD2.4–3.6 V | 2.4–3.6 V | Use separate local bypassing for VDD and VID even on a shared rail. Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika. |
| Interface supply VID1.65 V to VDD | 1.65 V to VDD | Set the logic levels and pull-ups using this voltage. Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika. |
| Measurement ranges14- or 16-bit output | 14- or 16-bit output | Select output depth using the control register. Apply the per-axis sensitivity coefficient to the raw value. Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika. |
Models and documents
Separate maps cover the AK8963N QFN and AK8963C wafer-level packages. Match the package-specific magnetic axes in the datasheet.
- AK8963C
- WLCSP-14 with two unpopulated ball positions.
- AK8963 manufacturer documentation· Asahi Kasei Microdevices MS1356-E-02 (October 2013), §§ 4–5 and 7–11. Manufacturer PDF hosted by MikroElektronika.